NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Thioglycolic acid

CAS
68-11-1

HSCH2COOH

RTECS
AI5950000
Synonyms & Trade Names

Acetyl mercaptan, Mercaptoacetate, Mercaptoacetic acid, 2-Mercaptoacetic acid, 2-Thioglycolic acid, Thiovanic acid
DOT ID & Guide
1940 / 153

Exposure
Limits

NIOSH REL: TWA 1 ppm (4 mg/m3) [skin]
OSHA PEL: none
IDLH
N.D. See: IDLH INDEX
Conversion
1 ppm = 3.77 mg/m3
Physical Description
Colorless liquid with a strong, disagreeable odor characteristic of mercaptans. [Note: Olfactory fatigue may occur after short exposures.]
MW: 92.1
BP: ?
FRZ: 2°F
Sol: Miscible
VP(64°F): 10 mmHg
IP: ?

Sp.Gr: 1.32
Fl.P: >230°F
UEL: ?
LEL: 5.9%

Class IIIB Combustible Liquid: Fl.P. at or above 200F.
Incompatibilities & Reactivities

Air, strong oxidizers, bases, active metals (e.g., sodium potassium, magnesium, calcium) [Note: Readily oxidized by air.]
Measurement Methods
None available
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation
Provide: Eyewash, Quick drench
First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
Not available.
Important additional information about respirator selection
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
Irritation eyes, skin, nose, throat; lacrimation (discharge of tears), corneal damage; skin burns, blisters; in animals: lassitude (weakness, exhaustion); gasping respirations; convulsions
Target Organs
Eyes, skin, respiratory system
See also: INTRODUCTION   See ICSC CARD: 0915